'Irreversibly' definitions:

Definition of 'irreversibly'

(from WordNet)
adverb
In an irreversible manner; "this old tradition is irreversibly disappearing"

Definition of 'Irreversibly'

From: GCIDE
  • Irreversibly \Ir`re*vers"i*bly\, adv. In an irreversible manner. [1913 Webster]